Table 3 Multivariate analysis for overall survival

Sex (female vs. male)

1.265

0.701

2.284

0.435

Age (<60 y vs. ≥ 60y)

0.953

0.552

1.646

0.864

Karnofsky performance status (≤80 vs. >80)

0.779

0.425

1.428

0.420

Pathological type (Squamous vs.Non-Squamous )

1.314

0.785

2.199

0.298

Tumor volume (per cm³ incerase)

1.002

1.000

1.003

0.054

T stage (T3-4 vs.T1-2)

1.209

0.677

2.157

0.521

N stage (N2-3 vs.N0-1)

1.015

0.435

2.366

0.973

Metastasis status (multi- vs. single)

1.765

1.032

3.018

0.038

Thoracic radiation dose (≥63 Gy vs. <63 Gy)

0.547

0.333

0.897

0.017

Response of primary tumor (SD + PD vs. CR + PR)

1.232

0.574

2.642

0.592

Radiotherapy to metastases (yes vs. no)

0.890

0.511

1.551

0.681